diff --git a/core/clingutils/src/TClingUtils.cxx b/core/clingutils/src/TClingUtils.cxx
index 7601968ed6e00a38bcbff1419d7447e07a154ba6..4a395fa9eef34989ad1177710897d5af21092abb 100644
--- a/core/clingutils/src/TClingUtils.cxx
+++ b/core/clingutils/src/TClingUtils.cxx
@@ -2887,10 +2887,8 @@ clang::QualType ROOT::TMetaUtils::AddDefaultParameters(clang::QualType instanceT
                if (ArgType.getArgument().isNull()
                    || ArgType.getArgument().getKind() != clang::TemplateArgument::Type) {
                   ROOT::TMetaUtils::Error("ROOT::TMetaUtils::AddDefaultParameters",
-                                          "Template parameter substitution failed for %s around %s",
-                                          instanceType.getAsString().c_str(),
-                                          SubTy.getAsString().c_str()
-                                          );
+                                          "Template parameter substitution failed for %s around %s\n",
+                                          instanceType.getAsString().c_str(), SubTy.getAsString().c_str());
                   break;
                }
                clang::QualType BetterSubTy = ArgType.getArgument().getAsType();